1 files changed, 54 insertions, 0 deletions
diff --git a/tests/disabled/not-representable/pos/annotated-treecopy/Impls_Macros_1.scala b/tests/disabled/not-representable/pos/annotated-treecopy/Impls_Macros_1.scala
new file mode 100644
index 000000000..986287dfa
--- /dev/null
+++ b/tests/disabled/not-representable/pos/annotated-treecopy/Impls_Macros_1.scala
@@ -0,0 +1,54 @@
+import scala.language.experimental.macros
+import scala.reflect.macros.blackbox.Context
+import collection.mutable.ListBuffer
+import collection.mutable.Stack
+
+object Macros {
+  trait TypedFunction {
+    def tree: scala.reflect.runtime.universe.Tree
+    val typeIn: String
+    val typeOut: String
+  }
+
+  def tree[T,U](f:Function1[T,U]): Function1[T,U] = macro tree_impl[T,U]
+
+  def tree_impl[T:c.WeakTypeTag,U:c.WeakTypeTag](c: Context)
+      (f:c.Expr[Function1[T,U]]): c.Expr[Function1[T,U]] = {
+    import c.universe._
+    import internal._
+    val ttag = c.weakTypeTag[U]
+    f match {
+      case Expr(Function(List(ValDef(_,n,tp,_)),b)) =>
+        // normalize argument name
+        var b1 = new Transformer {
+          override def transform(tree: Tree): Tree = tree match {
+            case Ident(x) if (x==n) => Ident(TermName("_arg"))
+            case tt: TypeTree if tt.original != null => setOriginal(TypeTree(tt.tpe), transform(tt.original))
+            // without the fix to LazyTreeCopier.Annotated, we would need to uncomment the line below to make the macro work
+            // that's because the pattern match in the input expression gets expanded into Typed(<x>, TypeTree(<Int @unchecked>))
+            // with the original of the TypeTree being Annotated(<@unchecked>, Ident(<x>))
+            // then the macro tries to replace all Ident(<x>) trees with Ident(<_arg>), recurs into the original of the TypeTree, changes it,
+            // but leaves the <@unchecked> part untouched. this signals the misguided LazyTreeCopier that the Annotated tree hasn't been modified,
+            // so the original tree should be copied over and returned => crash when later <x: @unchecked> re-emerges from TypeTree.original
+            // case Annotated(annot, arg) => treeCopy.Annotated(tree, transform(annot).duplicate, transform(arg))
+            case _ => super.transform(tree)
+          }
+        }.transform(b)
+
+        val reifiedTree = c.reifyTree(gen.mkRuntimeUniverseRef, EmptyTree, b1)
+        val reifiedExpr = c.Expr[scala.reflect.runtime.universe.Expr[T => U]](reifiedTree)
+        val template =
+          c.universe.reify(new (T => U) with TypedFunction {
+            override def toString = c.Expr[String](q"""${tp+" => "+ttag.tpe+" { "+b1.toString+" } "}""").splice // DEBUG
+            def tree = reifiedExpr.splice.tree
+            val typeIn = c.Expr[String](q"${tp.toString}").splice
+            val typeOut = c.Expr[String](q"${ttag.tpe.toString}").splice
+            def apply(_arg: T): U = c.Expr[U](b1)(ttag.asInstanceOf[c.WeakTypeTag[U]]).splice
+          })
+        val untyped = c.untypecheck(template.tree)
+
+        c.Expr[T => U](untyped)
+      case _ => sys.error("Bad function type")
+    }
+  }
+}